Assist with a few questions in my Wordpress Online Store

I have an online store with Wordpress, website is [login to view URL] - THE TEMPLATE IS ALREADY COMPLETE I have purchased a demo theme (Blaszok by MPC) which is already installed. I am capable of editing the entire website myself, I just need assistance with a FEW things, from the right Wordpress professional. 1. Tell me how I set up the payments - how/where do I put my account details into the back-end of my user interface? When my customers pay me with their credit card, I need to set up WHERE this goes. AND how do I integrate my PayPal account so people can also pay this way if they would prefer. 2. TEACH or TELL me how to change the photos in the Layer Slider, with my own images. 3. Move the logo from the left hand side to the MIDDLE of the menu header. 4. The theme has many "Homepage" options. I can't figure out how to make the page I want, as the main page. ALL OF THIS SHOULDN'T TAKE LONG!! It would take an experienced web developer and Wordpress professional not long at all to do this. Please offer prices accordingly. Please provide me with your experience and what you can help me with. I would prefer if you can TELL me how to do this rather than you doing it yourself.